The word hartaréis is the future form of hartar in the second person plural.
See the full hartar conjugation

hartar

Y os hartaréis sobre mi mesa, de caballos, y de caballeros fuertes, y de todos hombres de guerra, dice el Señor Jehová.
And ye shall be filled at my table with horses and chariots, with mighty men, and with all men of war, saith the Lord Jehovah.
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